Amber
Fossilized tree resin (not a true mineral as it is organic and amorphous); Chemical formula is highly variable, but often approximated as C10H16O.
Mineral
Category
Synthetic Polymer (Polylactic Acid)
Browse synthetic polymer (polylactic acid) specimens identified by the Rock Identifier community.
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Diamond (appearing as a jewelry centerpiece)
Diamond (Formula: C)
mineral
Fossiliferous Limestone
Calcium Carbonate (CaCO3) with Bioclasts
sedimentary
Coral Rock (Coquina)
Biogenic Limestone (Calcium Carbonate - CaCO3)
sedimentary
Peacock Ore (Bornite or Iridescent Chalcopyrite)
Bornite (Cu5FeS4) or Chalcopyrite (CuFeS2) with oxidation
mineral
Limestone Gravel
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone with Rugose Coral
Lithostrotionella (Limestone Matrix - CaCO3)
sedimentary
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Fossiliferous Limestone
Calcite-rich Sedimentary Rock (CaCO3)
sedimentary
Amber
(C10H16O)n – an amorphous organic substance, primarily composed of polymerized isoprenoids.
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
mineral
Fossiliferous Limestone (Coquina)
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sapphire
Corundum (Al2O3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Jewelry Chain with Blue and Clear Gemstones (Likely Cubic Zirconia)
Cubic Zirconia (ZrO₂), Silver or White Gold/Platinum Alloy
Mineral (synthetic) and Metal (precious/base)
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Black Limestone with Calcite Veins
Limestone (Calcium Carbonate, CaCO3)
sedimentary
Iron-stained Milky Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Limestone
Sedimentary Calcium Carbonate (CaCO3)
sedimentary
Turquoise (possible Howlite imitation)
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Turquoise
Turquoise, CuAl6(PO4)4(OH)8·4H2O
mineral
Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Limestone (Elephant Skin or Karst-weathered)
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Strawberry Quartz
Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite
Mineral
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Quartzite Pebble
Metamorphic rock predominantly composed of Quartz (SiO2)
metamorphic
Sand Grain (Quartz)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule fragment)
Silicon Dioxide (SiO2)
sedimentary
River Quartz / Quartzite Pebbles
Quartzite (primarily Silicon Dioxide, SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Kidney Stone (Medical Specimen)
Calcium oxalate monohydrate (Whewellite) / CaC2O4·H2O
Mineral (Biogenic)
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Limestone with Fossil inclusions
Fossiliferous Limestone (CaCO3)
sedimentary
Bismuth
Bismuth (Bi)
mineral
Rutilated Quartz
SiO2 with TiO2 inclusions (Rutile)
Mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
Mineral
Quartzite (River Stone)
Quartzite
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic